Water quality monitor



FIG. 1 is an isometric view of a top, front, and left side of one embodiment of an ornamental design of a water quality monitor;

FIG. 2 is a front elevational view of the water quality monitor of FIG. 1;

FIG. 3 is a rear elevational view of the water quality monitor of FIG. 1;

FIG. 4 is a left side elevational view of the water quality monitor of FIG. 1;

FIG. 5 is a right side elevational view of the water quality monitor of FIG. 1;

FIG. 6 is a top plan view of the water quality monitor of FIG. 1; and,

FIG. 7 is a bottom plan view of the water quality monitor of FIG. 1. 

CLAIM The ornamental design for a water quality monitor, as shown and described. 